Software architecture is a subfield of software development process and is also referred to as architectural decisions. It deals with the development, design, construction, deployment, maintenance, and production of structures which are the part of software systems. It includes software elements, their interrelation and their properties. This book is compiled in such a manner, that it will provide in-depth knowledge about the theory and practice of software architecture. Some of the diverse topics covered in it address the varied branches that fall under this category. This textbook is a complete source of knowledge on the present status of this important field. It is meant for those who are seeking a comprehensive analysis of the present status of this field.